CHEVY ACCUMULATOR DOESN'T GET COLD AND THE AIR I

My air comming out into my 1993 Astro isn't any cooler than the outside air. I checked the system and it reads in the blue area on my gauges. I noticed that the accumulator isn't sweating even after half hour of running. The compressor is comming on and off as I think it should. Any idea what I can check or change. Wife's ride so I need this fixxed. Thank you. What would be an O.K. Donation for this site? I love it and want to keep it and you guys avalable. Thank for all your help.